The yellow/blue cube in f102v2

[MarcoP]

I remember there is a genius sapon (Latin: soap) for a family of plants much used in traditional soaps. Don't remember much else about them - soap comes in a bottle for me

Saponaria (soapwort). Here is example from Egerton 747
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Koen - here is example of "cube" soap

You are right, Ellie and David! If you search "saponaria" on the forum, you will find links to two XV Century herbals (Cadamosto's and Auslasser's). The plant is also illustrated in the 1491 German Hortus Sanitatis I previously linked (img 383).

PS: Auslasser's illustration is at the end of the herbal and it's unfinished and unlabeled. I think it could just as well be vinca minor.